How are harmonics created and what are the benefits of harnessing harmonics?
Photovoltaic SVG Selection Guide
Calculation formula
QSVG=PPV×tan(arccosϕ1−arccosϕ2)
：Rated power of photovoltaic power station (kW);
：Power factor before compensation; φ2: target power factor (usually 0.95~1).
Recommendation: Considering the light fluctuation, the capacity needs to be increased by 20%~30% (e.g. 1MW PV with ±300kvar SVG).
Installation precautions
Spatial layout: SVG should be close to the grid connection point and keep a distance of ≥3m from the inverter to avoid electromagnetic interference;
Heat dissipation design: Outdoor cabinets need IP54 protection, and the air outlet of the forced air cooling radiator faces north (avoid direct sunlight);
Grid compatibility: Detect grid background harmonics in advance and configure adaptive filtering algorithms.
Comparison of effects before and after installation (taking a 20MW photovoltaic power station as an example)
| Items | Before Installation | After Installation | Revenue Analysis |
| Power Factor | 0.85（±0.1） | 0.99 | Annual fines reduced by approximately 24000USD |
| Voltage pass rate | 88% | 99.8% | Reduce offline losses and increase annual revenue by 68000USD |
| System loss | 6.2% | 5.1% | Annual electricity bill savings of 33000USD |
| Harmonic distortion | THDi=8.5% | THDi=2.3% | Extend transformer life by 3~5 years |
SVG is a key device for photovoltaic power stations to achieve the dual goals of “high penetration and high power quality”. Choosing an appropriate SVG solution can significantly increase power generation revenue and reduce operation and maintenance costs. Contact us to obtain exclusive photovoltaic SVG configuration solutions
